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RE46C191 Datasheet(PDF) 28 Page - Microchip Technology

Part # RE46C191
Description  CMOS Low-Voltage Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
PDF  44 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

RE46C191 Datasheet(HTML) 28 Page - Microchip Technology

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RE46C191
DS20005225H-page 28
 2013-2023 Microchip Technology Inc. and its subsidiaries
5.1.3
LOW BATTERY CHECK CURRENT
The low battery check current is the current required for
the low battery test. It includes both the loaded (RLED
on) and unloaded (RLED off) tests. The boost
component of the loaded test represents the cost of
charging the boost capacitor to the higher voltage level.
This has a fixed cost for every loaded check because
the
capacitor
is
gradually
discharged
during
subsequent operations and the energy is generally not
recovered. The other calculations are similar to those
shown in Equation 5-1. The unloaded test has a
minimal contribution because it involves only some
internal reference and comparator circuitry.
5.1.4
BATTERY LIFE
When estimating the battery life, several additional
factors must be considered. These include battery
resistance, battery self-discharge rate, capacitor
leakages and the effect of the operating temperature
on all of these characteristics. Some number of false
alarms and user tests must also be included in any
calculation.
For 10-year applications, a 3V spiral wound lithium
manganese dioxide battery with a laser seal is recom-
mended. These can be found with capacities of 1400 to
1600 mAh.
5.1.5
FUNCTIONAL TIMING DIAGRAMS
FIGURE 5-1:
RE46C191 Timing Diagram – Standby, No Alarm, Low Supply Test Failure and
Chamber Test Failure.
Standby, No Alarm (not to Scale)
TIRON
TPER0
IRED
Chamber Test
(Internal Signal)
TPCT1
Low Battery Test
(Internal signal)
TPLB2
TON1
RLED
TPLB1
LTD Sample
TLTD
EOL
TEOL
Low Supply Test Failure
Low Battery Test
(Internal signal)
RLED
THON1
HORN
THPER1
Chamber Test Failure
Chamber Test
(Internal Signal)
THON2
HORN
THOF2
THPER2



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